Having rules that specify specific parts, weights, dimensions, and more means everyone, theoretically, is running the same car with the same performance, making the race more about driver skill and race strategy. It is a great, cost effective, way to go racing while being ...Having rules that specify specific parts, weights, dimensions, and more means everyone, theoretically, is running the same car with the same performance, making the race more about driver skill and race strategy. It is a great, cost effective, way to go racing while being competitive and having some fun.
One such spec item the IMCA mandates for many of their racing classes, including Modifieds, Hobby Stock, and others, is the use of the ’78-’88 GM Metric caliper. Having the same caliper body and piston size as an approved IMCA part means everyone has the same braking system capability. The issue has been finding a good GM Metric caliper though.
Parts store remans are iffy at best, often being remanufactured with substandard parts, and requiring core charges or turning in your old calipers. Furthermore, standard piston dust seals are included in our brake caliper casting for extremely low maintenance requirements. These disc brake pistons are designed to fit best with 1-inch wide disc brake rotors but will work with .810-inch rotors as well when fitted with our disc brake pad spacer.